linux-kernel - [PATCH] staging: rtl8188eu: Fix a sleep-in-atomic-context bug in issue_deauth

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Message-Id: <20180915025711.7414-1-baijiaju1990@gmail.com>
Date:   Sat, 15 Sep 2018 10:57:11 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     gregkh@...uxfoundation.org, aishpant@...il.com,
        straube.linux@...il.com, santhameena13@...il.com,
        jananis37@...il.com, keescook@...omium.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] staging: rtl8188eu: Fix a sleep-in-atomic-context bug in issue_deauth_ex()

The driver may sleep with holding a spinlock.
The function call path (from bottom to top) in Linux-4.17 is:

[FUNC] msleep
drivers/staging/rtl8188eu/core/rtw_mlme_ext.c, 1536: 
	msleep in issue_deauth_ex
drivers/staging/rtl8188eu/core/rtw_mlme_ext.c, 5110: 
	issue_deauth_ex in disconnect_hdl
drivers/staging/rtl8188eu/core/rtw_cmd.c, 521: 
	disconnect_hdl in rtw_disassoc_cmd
drivers/staging/rtl8188eu/core/rtw_ioctl_set.c, 352: 
	rtw_disassoc_cmd in rtw_set_802_11_infrastructure_mode
drivers/staging/rtl8188eu/os_dep/ioctl_linux.c, 1002: 
	rtw_set_802_11_infrastructure_mode in rtw_wx_set_wap
drivers/staging/rtl8188eu/os_dep/ioctl_linux.c, 988: 
	spin_lock_bh in rtw_wx_set_wap

To fix this bug, msleep() is replaced with mdelay().

This bug is found by my static analysis tool DSAC.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/staging/rtl8188eu/core/rtw_mlme_ext.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8188eu/core/rtw_mlme_ext.c b/drivers/staging/rtl8188eu/core/rtw_mlme_ext.c
index 1115050077e4..f47d83e6dfb9 100644
--- a/drivers/staging/rtl8188eu/core/rtw_mlme_ext.c
+++ b/drivers/staging/rtl8188eu/core/rtw_mlme_ext.c
@@ -1513,7 +1513,7 @@ static int issue_deauth_ex(struct adapter *padapter, u8 *da,
 			break;
 
 		if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
-			msleep(wait_ms);
+			mdelay(wait_ms);
 	} while ((i < try_cnt) && ((ret == _FAIL) || (wait_ms == 0)));
 
 	if (ret != _FAIL) {
-- 
2.17.0